The Cinelli expander worked perfectly with the Origin8 Synergy Pro 1" aluminum steerer fork. It has a six millimeter hex hollow bolt, the hollow threaded for the M5 preload bolt and cap. Even though it is for one inch, the included cap is for 1 1/8". You'll need a 1" cap unless using a 1 1/8" clamp stem with a shim. When measuring for the steerer cut, subtract two millimeters for the top of the expander because the end sits flush with the top of the steerer. I like how the expander supports the clamp area of the stem. Leave a few mm steerer above the stem for max friction and stem support. Especially important with carbon. Note the crown race is JIS 27.0mm, so I used the Origin8 headset. Part number for the plug:



Getting closer to knowing what to expect from a tire on a rim. 75mm or so b2b equals 29mm on i19, and 27mm on i14. i19 was too tight, 29mm in front. i14 is off the recommendation chart but I'll take it. Specs state 28c for the fork. That doesn't necessarily mean 28mm, that's tight. The fork works well. This fork is a good fit for a 1992 Series 5 Paramount Design Group. Even handling, no hands riding is true.

Fork bends some, good for comfort. But hoping never to hear the violent crack carbon makes when its threads snap. That happened to me descending Big Tujunga going west at the bridge with a Bike Nashbar 1" carbon fork on this same bike. That fork was retired. The bike now has 27mm wide in front on i14, 29mm wide in back on i19. The hunt continues for the elusive all steel racing bike that does 28mm front and back. I'll have to tread lightly now that carbon is in front. The bike is half a pound lighter. Aheadset system and threadless stem is elegant compared to an adapter quill.